4 Digit User Code for timeclock

Good Afternoon,

I work for a small business in Auburn Hills, MI in the I.T. department. We mainly do C# projects here and no one in the group knows much PHP.

The warehouse manager wants us to revamp how the warehouse people punch in and out. They presently choose their name from a scrolldown and proceed from there. We need to change the name selection to a 4 digit user code. Please Help. Thx!